Leading tabs in pasted text can be interpreted as tab-completion instead of tab character (\t)

[helpimnotdrowning]

Windows Terminal version

1.21.1272.0

Windows build number

10.0.26120.0

Other Software

Powershell	7.4.2 (Windows and Linux)
Clink (for CMD)	1.6.13.eb61b2
SSH server	OpenSSH_9.2p1 Debian-2+deb12u2, OpenSSL 3.0.11 19 Sep 2023
SSH client	OpenSSH_for_Windows_9.5p1, LibreSSL 3.8.2

Steps to reproduce

Paste the following text into a shell (pwsh, cmd, linux pwsh/ssh, NOT cygwin bash, linux bash/ssh):

class A {
	$x
	$y
}

ls | % {
	[A]@{
		x = $_
	}
}

Expected Behavior

The following text to appear in the shell:


(4 space characters were used in place of tabs when pasting for these examples)

Actual Behavior

Tab characters are interpreted (but the 1st one per line is ignored, running tab-completion, instead of pasting the real tab (\t)

Note how the tabs in the class definition have dissapeared, turning the code from

class A {
	$x
	$y
}

into

class A {
$x
$y
}

The first tab is ignored in these lines, but the functionality does not change since only the whitespace was deleted.
However, with the second part,

ls | % {
	[A]@{
		x = $_
	}
}

becomes

ls | % {
[A]@{
yx = $_
x}
}

Once again, the first tab is ignored, but now the functionality has changed: the second tab in line 2 was interpreted as tab-completion, turning the line x = $_ into yx = $_ and line 3's } into x}

Instead of normal operation,

it instead errors out.

Powershell/linux over ssh also tab-completes in a similar way:

Similarly for cmd,

where .android/ and .cache./ are the 1st and 2nd directories in my ~; here, the 1st tab is not ignored and is used for tab-completion

--

cygwin bash works as expected:

, as does bash/linux over ssh:

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[lhecker]

There's no difference between your tab key and tab character. When you press the tab key it simply emits a \t to the shell. But PSReadLine can technically differentiate between a paste from the clipboard and manual typing by parsing the bracketed paste sequence: PowerShell/PSReadLine#1471
For some reason though, that doesn't seem to work for tabs. I think we can consider that a PSReadLine issue.

[carlos-zamora]

Thanks for filing! As Leonard mentioned above, we're gonna mark this as /dup of PowerShell/PSReadLine#1471

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